E03018 10/06 AC Drive System Electrical Checkout Procedure E3-19
(Release 21 Software)
TABLE IV. TCI DIGITAL INPUT CHECKS
STEP INPUT DESCRIPTION
1 ENGSTRTREQ Engine Start Request - DO NOT CHECK AT THIS TIME.
2 ENGCAUTION
Check Engine Caution Lamp - Jumper circuit 419M @ TB30 to ground to illuminate the lamp in the overhead
panel. ENGCAUTION on the PTU should be highlighted.
3
CONTROLON
WARM-UP
Control Power ON & Engine Warm-Up - DO NOT CHECK AT THIS TIME.
4ENGWARN
Engine Service Light - Jumper 528A @ TB32 to ground to illuminate the blue indicator lamp on the back of the
center console.
5ENGKILL
Engine Shutdown Switch - Pull up on switch on center console. Verify that circuit 439 @ TB25 changes from
24VDC to 0VDC. Push down the switch to reset the system.
6BODYDWN
Body Up Switch (activated when body is down) - Place a washer on body-up switch. Verify that circuits 63L &
71F change from 0VDC to 24VDC and the lamp in the overhead panel is OFF.
7 RESTSW
Rest Switch - Move the Rest Switch to the REST position. Verify that the internal lamp on the Rest Switch
illuminates when in the REST position.
8 REVREQ
Reverse Request - Move the selector lever to the REVERSE position. The parking brake will release, circuit
52PBO will be 24VDC, and circuit 52CS will be 0VDC.
9FORREQ
Forward Request - Move the selector lever to the FORWARD position. The parking brake will release, circuit
52PBO will be 24VDC, and circuit 52CS will be 0VDC.
10 NEUREQ
Neutral Request - Move the selector lever to the NEUTRAL position. The parking brake will release, circuit
52PBO will be 24VDC, and circuit 52CS will be 0VDC.
11 PRKBRKSW
Parking Brake Switch - Move the selector lever to the PARK position. PRKBRKSW on the PTU should be
highlighted. (NOTE: The parking brake solenoid is controlled by the VHMS Interface Module. See VHMS/
Interface Module Checkout Procedure to fully test this function.)
12 RSC Retard Speed Control Switch - Pull up the switch on the center console.
13 MIDPAYLD Truck at 70% Payload - Jumper 73MS @TB25 to ground. (NOTE: RB2 circuit breakers must be OFF if installed.)
14 FULLPAYLD Truck Fully Loaded - Jumper 73LS @TB25 to ground. (NOTE: RB2 circuit breakers must be OFF if installed.)
15 OVERPAYLD Truck Overloaded - Jumper circuit 72IP@TB29 to circuit 712 @ TB32.
16 RESET Override/Fault Reset Switch - Push the switch on the center console.
17 LAMPTEST
Lamp Test Switch - Push the switch on the dash panel. All warning/status lights in the overhead panel should
illuminate except for the bottom two rows, the backup horn sounds, and the retard lights at the rear of the truck
and on top of the cab turn on.
18 DATASTORE Data Store Switch - Push the switch on the back of the center console.
19 AXLEP Axle Pressure Switch - Jumper across the air pressue switch in the rear axle housing.
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